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rosrun oafd path_following.py error

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i got a problem with pat_following.py Traceback (most recent call last): File "/home/arief/FYPworkspaces/catkin_ws_OAFD/src/OAFD_Monocular/src/simple_tf.py", line 29, in get_transformation self.transformation = self.tf_buffer.lookup_transform(self.target_frame, File "/opt/ros/noetic/lib/python3/dist-packages/tf2_ros/buffer.py", line 90, in lookup_transform return self.lookup_transform_core(target_frame, source_frame, time)...